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<meta property="og:description" content="Spring kafka 要点

以下内容记录了一些工作中遇到的kafka的要点（个人认为）

一、kafka消费者
1.1、源码分析
1.1.1、 @EnableKafka
作用：kafka开启入口


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@Target(ElementType.TYPE)
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@Documented
@Import(KafkaBootstrapConfiguration.class) // 最重要的入口配置
public @interface EnableKafka {
}


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<meta name="twitter:description" content="Spring kafka 要点

以下内容记录了一些工作中遇到的kafka的要点（个人认为）

一、kafka消费者
1.1、源码分析
1.1.1、 @EnableKafka
作用：kafka开启入口


1
2
3
4
5
6


@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(KafkaBootstrapConfiguration.class) // 最重要的入口配置
public @interface EnableKafka {
}


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                <div class="details-content toc-content" id="toc-content-static"><nav id="TableOfContents">
  <ul>
    <li><a href="#一kafka消费者">一、kafka消费者</a>
      <ul>
        <li><a href="#11源码分析">1.1、源码分析</a>
          <ul>
            <li><a href="#111-enablekafka">1.1.1、 <code>@EnableKafka</code></a></li>
            <li><a href="#1111-kafkabootstrapconfiguration">1.1.1.1、 <code>KafkaBootstrapConfiguration</code></a>
              <ul>
                <li><a href="#11111-kafkalistenerannotationbeanpostprocessor">1.1.1.1.1、 <code>KafkaListenerAnnotationBeanPostProcessor</code></a>
                  <ul>
                    <li><a href="#111111-postprocessafterinitialization">1.1.1.1.1.1、 <code>postProcessAfterInitialization</code></a></li>
                    <li><a href="#111112processkafkalistener">1.1.1.1.1.2、<code>processKafkaListener</code></a></li>
                    <li><a href="#111113processlistener">1.1.1.1.1.3、<code>processListener</code></a></li>
                    <li><a href="#111114kafkalistenerendpointregistrar类registerendpoint方法">1.1.1.1.1.4、<code>KafkaListenerEndpointRegistrar</code>类<code>registerEndpoint</code>方法</a></li>
                  </ul>
                </li>
                <li><a href="#11112kafkalistenerendpointregistry">1.1.1.1.2、<code>KafkaListenerEndpointRegistry</code></a>
                  <ul>
                    <li><a href="#111121-registerlistenercontainer">1.1.1.1.2.1、 <code>registerListenerContainer</code></a></li>
                    <li><a href="#111122createlistenercontainer">1.1.1.1.2.2、<code>createListenerContainer</code></a></li>
                    <li><a href="#111123createlistenercontainer">1.1.1.1.2.3、<code>createListenerContainer</code></a></li>
                    <li><a href="#111124createcontainerinstance">1.1.1.1.2.4、<code>createContainerInstance</code></a></li>
                    <li><a href="#111125initializecontainer">1.1.1.1.2.5、<code>initializeContainer</code></a></li>
                  </ul>
                </li>
              </ul>
            </li>
          </ul>
        </li>
        <li><a href="#113-kafkamessagelistenercontainer">1.1.3、 <code>KafkaMessageListenerContainer</code></a></li>
      </ul>
    </li>
    <li><a href="#12-要点">1.2 要点</a></li>
    <li><a href="#引用">引用</a></li>
  </ul>
</nav></div>
            </div><div class="content" id="content"><h1 id="spring-kafka-要点">Spring kafka 要点</h1>
<blockquote>
<p>以下内容记录了一些工作中遇到的kafka的要点（个人认为）</p>
</blockquote>
<h2 id="一kafka消费者">一、kafka消费者</h2>
<h3 id="11源码分析">1.1、源码分析</h3>
<h4 id="111-enablekafka">1.1.1、 <code>@EnableKafka</code></h4>
<p>作用：kafka开启入口</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Target</span><span class="o">(</span><span class="n">ElementType</span><span class="o">.</span><span class="na">TYPE</span><span class="o">)</span>
<span class="nd">@Retention</span><span class="o">(</span><span class="n">RetentionPolicy</span><span class="o">.</span><span class="na">RUNTIME</span><span class="o">)</span>
<span class="nd">@Documented</span>
<span class="nd">@Import</span><span class="o">(</span><span class="n">KafkaBootstrapConfiguration</span><span class="o">.</span><span class="na">class</span><span class="o">)</span> <span class="c1">// 最重要的入口配置
</span><span class="c1"></span><span class="kd">public</span> <span class="nd">@interface</span> <span class="n">EnableKafka</span> <span class="o">{</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h4 id="1111-kafkabootstrapconfiguration">1.1.1.1、 <code>KafkaBootstrapConfiguration</code></h4>
<p>作用：kafka启动配置类，该类主要实例化以下两个Bean</p>
<h5 id="11111-kafkalistenerannotationbeanpostprocessor">1.1.1.1.1、 <code>KafkaListenerAnnotationBeanPostProcessor</code></h5>
<p>作用：实现BeanPostProcessor接口，重写方法</p>
<h6 id="111111-postprocessafterinitialization">1.1.1.1.1.1、 <code>postProcessAfterInitialization</code></h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
    <span class="kd">public</span> <span class="n">Object</span> <span class="nf">postProcessAfterInitialization</span><span class="o">(</span><span class="kd">final</span> <span class="n">Object</span> <span class="n">bean</span><span class="o">,</span> <span class="kd">final</span> <span class="n">String</span> <span class="n">beanName</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">BeansException</span> <span class="o">{</span>
        <span class="k">if</span> <span class="o">(!</span><span class="k">this</span><span class="o">.</span><span class="na">nonAnnotatedClasses</span><span class="o">.</span><span class="na">contains</span><span class="o">(</span><span class="n">bean</span><span class="o">.</span><span class="na">getClass</span><span class="o">()))</span> <span class="o">{</span>
            <span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">targetClass</span> <span class="o">=</span> <span class="n">AopUtils</span><span class="o">.</span><span class="na">getTargetClass</span><span class="o">(</span><span class="n">bean</span><span class="o">);</span>
      <span class="c1">// 找到标记在类上的@KafkaListener注解
</span><span class="c1"></span>            <span class="n">Collection</span><span class="o">&lt;</span><span class="n">KafkaListener</span><span class="o">&gt;</span> <span class="n">classLevelListeners</span> <span class="o">=</span> <span class="n">findListenerAnnotations</span><span class="o">(</span><span class="n">targetClass</span><span class="o">);</span>
            <span class="kd">final</span> <span class="kt">boolean</span> <span class="n">hasClassLevelListeners</span> <span class="o">=</span> <span class="n">classLevelListeners</span><span class="o">.</span><span class="na">size</span><span class="o">()</span> <span class="o">&gt;</span> <span class="n">0</span><span class="o">;</span>
            <span class="kd">final</span> <span class="n">List</span><span class="o">&lt;</span><span class="n">Method</span><span class="o">&gt;</span> <span class="n">multiMethods</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
      <span class="c1">// 找到标记在方法上的@KafkaListener注解
</span><span class="c1"></span>            <span class="n">Map</span><span class="o">&lt;</span><span class="n">Method</span><span class="o">,</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">KafkaListener</span><span class="o">&gt;&gt;</span> <span class="n">annotatedMethods</span> <span class="o">=</span> <span class="n">MethodIntrospector</span><span class="o">.</span><span class="na">selectMethods</span><span class="o">(</span><span class="n">targetClass</span><span class="o">,</span>
                    <span class="k">new</span> <span class="n">MethodIntrospector</span><span class="o">.</span><span class="na">MetadataLookup</span><span class="o">&lt;</span><span class="n">Set</span><span class="o">&lt;</span><span class="n">KafkaListener</span><span class="o">&gt;&gt;()</span> <span class="o">{</span>

                        <span class="nd">@Override</span>
                        <span class="kd">public</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">KafkaListener</span><span class="o">&gt;</span> <span class="nf">inspect</span><span class="o">(</span><span class="n">Method</span> <span class="n">method</span><span class="o">)</span> <span class="o">{</span>
                            <span class="n">Set</span><span class="o">&lt;</span><span class="n">KafkaListener</span><span class="o">&gt;</span> <span class="n">listenerMethods</span> <span class="o">=</span> <span class="n">findListenerAnnotations</span><span class="o">(</span><span class="n">method</span><span class="o">);</span>
                            <span class="k">return</span> <span class="o">(!</span><span class="n">listenerMethods</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">()</span> <span class="o">?</span> <span class="n">listenerMethods</span> <span class="o">:</span> <span class="kc">null</span><span class="o">);</span>
                        <span class="o">}</span>

                    <span class="o">});</span>
            <span class="k">if</span> <span class="o">(</span><span class="n">hasClassLevelListeners</span><span class="o">)</span> <span class="o">{</span>
                <span class="n">Set</span><span class="o">&lt;</span><span class="n">Method</span><span class="o">&gt;</span> <span class="n">methodsWithHandler</span> <span class="o">=</span> <span class="n">MethodIntrospector</span><span class="o">.</span><span class="na">selectMethods</span><span class="o">(</span><span class="n">targetClass</span><span class="o">,</span>
                        <span class="o">(</span><span class="n">ReflectionUtils</span><span class="o">.</span><span class="na">MethodFilter</span><span class="o">)</span> <span class="n">method</span> <span class="o">-&gt;</span>
                                <span class="n">AnnotationUtils</span><span class="o">.</span><span class="na">findAnnotation</span><span class="o">(</span><span class="n">method</span><span class="o">,</span> <span class="n">KafkaHandler</span><span class="o">.</span><span class="na">class</span><span class="o">)</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">);</span>
                <span class="n">multiMethods</span><span class="o">.</span><span class="na">addAll</span><span class="o">(</span><span class="n">methodsWithHandler</span><span class="o">);</span>
            <span class="o">}</span>
            <span class="k">if</span> <span class="o">(</span><span class="n">annotatedMethods</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">())</span> <span class="o">{</span>
                <span class="k">this</span><span class="o">.</span><span class="na">nonAnnotatedClasses</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">bean</span><span class="o">.</span><span class="na">getClass</span><span class="o">());</span>
                <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">logger</span><span class="o">.</span><span class="na">isTraceEnabled</span><span class="o">())</span> <span class="o">{</span>
                    <span class="k">this</span><span class="o">.</span><span class="na">logger</span><span class="o">.</span><span class="na">trace</span><span class="o">(</span><span class="s">&#34;No @KafkaListener annotations found on bean type: &#34;</span> <span class="o">+</span> <span class="n">bean</span><span class="o">.</span><span class="na">getClass</span><span class="o">());</span>
                <span class="o">}</span>
            <span class="o">}</span>
            <span class="k">else</span> <span class="o">{</span>
                <span class="c1">// Non-empty set of methods
</span><span class="c1"></span>                <span class="k">for</span> <span class="o">(</span><span class="n">Map</span><span class="o">.</span><span class="na">Entry</span><span class="o">&lt;</span><span class="n">Method</span><span class="o">,</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">KafkaListener</span><span class="o">&gt;&gt;</span> <span class="n">entry</span> <span class="o">:</span> <span class="n">annotatedMethods</span><span class="o">.</span><span class="na">entrySet</span><span class="o">())</span> <span class="o">{</span>
                    <span class="n">Method</span> <span class="n">method</span> <span class="o">=</span> <span class="n">entry</span><span class="o">.</span><span class="na">getKey</span><span class="o">();</span>
                    <span class="k">for</span> <span class="o">(</span><span class="n">KafkaListener</span> <span class="n">listener</span> <span class="o">:</span> <span class="n">entry</span><span class="o">.</span><span class="na">getValue</span><span class="o">())</span> <span class="o">{</span>
            <span class="c1">// 重要的方法，处理kafkaListener
</span><span class="c1"></span>                        <span class="n">processKafkaListener</span><span class="o">(</span><span class="n">listener</span><span class="o">,</span> <span class="n">method</span><span class="o">,</span> <span class="n">bean</span><span class="o">,</span> <span class="n">beanName</span><span class="o">);</span>
                    <span class="o">}</span>
                <span class="o">}</span>
                <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">logger</span><span class="o">.</span><span class="na">isDebugEnabled</span><span class="o">())</span> <span class="o">{</span>
                    <span class="k">this</span><span class="o">.</span><span class="na">logger</span><span class="o">.</span><span class="na">debug</span><span class="o">(</span><span class="n">annotatedMethods</span><span class="o">.</span><span class="na">size</span><span class="o">()</span> <span class="o">+</span> <span class="s">&#34; @KafkaListener methods processed on bean &#39;&#34;</span>
                            <span class="o">+</span> <span class="n">beanName</span> <span class="o">+</span> <span class="s">&#34;&#39;: &#34;</span> <span class="o">+</span> <span class="n">annotatedMethods</span><span class="o">);</span>
                <span class="o">}</span>
            <span class="o">}</span>
            <span class="k">if</span> <span class="o">(</span><span class="n">hasClassLevelListeners</span><span class="o">)</span> <span class="o">{</span>
                <span class="n">processMultiMethodListeners</span><span class="o">(</span><span class="n">classLevelListeners</span><span class="o">,</span> <span class="n">multiMethods</span><span class="o">,</span> <span class="n">bean</span><span class="o">,</span> <span class="n">beanName</span><span class="o">);</span>
            <span class="o">}</span>
        <span class="o">}</span>
        <span class="k">return</span> <span class="n">bean</span><span class="o">;</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h6 id="111112processkafkalistener">1.1.1.1.1.2、<code>processKafkaListener</code></h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java">    <span class="kd">protected</span> <span class="kt">void</span> <span class="nf">processKafkaListener</span><span class="o">(</span><span class="n">KafkaListener</span> <span class="n">kafkaListener</span><span class="o">,</span> <span class="n">Method</span> <span class="n">method</span><span class="o">,</span> <span class="n">Object</span> <span class="n">bean</span><span class="o">,</span> <span class="n">String</span> <span class="n">beanName</span><span class="o">)</span> <span class="o">{</span>
        <span class="n">Method</span> <span class="n">methodToUse</span> <span class="o">=</span> <span class="n">checkProxy</span><span class="o">(</span><span class="n">method</span><span class="o">,</span> <span class="n">bean</span><span class="o">);</span>
    <span class="c1">// new endpoint实例，表示一个kafkaListener切入点
</span><span class="c1"></span>        <span class="n">MethodKafkaListenerEndpoint</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;</span> <span class="n">endpoint</span> <span class="o">=</span> <span class="k">new</span> <span class="n">MethodKafkaListenerEndpoint</span><span class="o">&lt;&gt;();</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setMethod</span><span class="o">(</span><span class="n">methodToUse</span><span class="o">);</span>
      <span class="c1">// 处理Listener
</span><span class="c1"></span>        <span class="n">processListener</span><span class="o">(</span><span class="n">endpoint</span><span class="o">,</span> <span class="n">kafkaListener</span><span class="o">,</span> <span class="n">bean</span><span class="o">,</span> <span class="n">methodToUse</span><span class="o">,</span> <span class="n">beanName</span><span class="o">);</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h6 id="111113processlistener">1.1.1.1.1.3、<code>processListener</code></h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">protected</span> <span class="kt">void</span> <span class="nf">processListener</span><span class="o">(</span><span class="n">MethodKafkaListenerEndpoint</span><span class="o">&lt;?,</span> <span class="o">?&gt;</span> <span class="n">endpoint</span><span class="o">,</span> <span class="n">KafkaListener</span> <span class="n">kafkaListener</span><span class="o">,</span>
            <span class="n">Object</span> <span class="n">bean</span><span class="o">,</span> <span class="n">Object</span> <span class="n">adminTarget</span><span class="o">,</span> <span class="n">String</span> <span class="n">beanName</span><span class="o">)</span> <span class="o">{</span>

        <span class="n">String</span> <span class="n">beanRef</span> <span class="o">=</span> <span class="n">kafkaListener</span><span class="o">.</span><span class="na">beanRef</span><span class="o">();</span>
        <span class="k">if</span> <span class="o">(</span><span class="n">StringUtils</span><span class="o">.</span><span class="na">hasText</span><span class="o">(</span><span class="n">beanRef</span><span class="o">))</span> <span class="o">{</span>
            <span class="k">this</span><span class="o">.</span><span class="na">listenerScope</span><span class="o">.</span><span class="na">addListener</span><span class="o">(</span><span class="n">beanRef</span><span class="o">,</span> <span class="n">bean</span><span class="o">);</span>
        <span class="o">}</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setBean</span><span class="o">(</span><span class="n">bean</span><span class="o">);</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setMessageHandlerMethodFactory</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">messageHandlerMethodFactory</span><span class="o">);</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setId</span><span class="o">(</span><span class="n">getEndpointId</span><span class="o">(</span><span class="n">kafkaListener</span><span class="o">));</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setGroupId</span><span class="o">(</span><span class="n">getEndpointGroupId</span><span class="o">(</span><span class="n">kafkaListener</span><span class="o">,</span> <span class="n">endpoint</span><span class="o">.</span><span class="na">getId</span><span class="o">()));</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setTopicPartitions</span><span class="o">(</span><span class="n">resolveTopicPartitions</span><span class="o">(</span><span class="n">kafkaListener</span><span class="o">));</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setTopics</span><span class="o">(</span><span class="n">resolveTopics</span><span class="o">(</span><span class="n">kafkaListener</span><span class="o">));</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setTopicPattern</span><span class="o">(</span><span class="n">resolvePattern</span><span class="o">(</span><span class="n">kafkaListener</span><span class="o">));</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setClientIdPrefix</span><span class="o">(</span><span class="n">resolveExpressionAsString</span><span class="o">(</span><span class="n">kafkaListener</span><span class="o">.</span><span class="na">clientIdPrefix</span><span class="o">(),</span>
                <span class="s">&#34;clientIdPrefix&#34;</span><span class="o">));</span>
        <span class="n">String</span> <span class="n">group</span> <span class="o">=</span> <span class="n">kafkaListener</span><span class="o">.</span><span class="na">containerGroup</span><span class="o">();</span>
        <span class="o">...</span>
        <span class="n">String</span> <span class="n">concurrency</span> <span class="o">=</span> <span class="n">kafkaListener</span><span class="o">.</span><span class="na">concurrency</span><span class="o">();</span>
        <span class="o">...</span>
        <span class="n">resolveKafkaProperties</span><span class="o">(</span><span class="n">endpoint</span><span class="o">,</span> <span class="n">kafkaListener</span><span class="o">.</span><span class="na">properties</span><span class="o">());</span>

      <span class="c1">// 设置 KafkaListenerContainerFactory
</span><span class="c1"></span>        <span class="n">KafkaListenerContainerFactory</span><span class="o">&lt;?&gt;</span> <span class="n">factory</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
        <span class="n">String</span> <span class="n">containerFactoryBeanName</span> <span class="o">=</span> <span class="n">resolve</span><span class="o">(</span><span class="n">kafkaListener</span><span class="o">.</span><span class="na">containerFactory</span><span class="o">());</span>
        <span class="o">...</span>
        <span class="n">endpoint</span><span class="o">.</span><span class="na">setBeanFactory</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">beanFactory</span><span class="o">);</span>
        <span class="o">...</span>
    <span class="c1">// 将endpoint 登记到 KafkaListenerEndpointRegistrar 中，前面一大段代码都是设置endpoint属性
</span><span class="c1"></span>    <span class="c1">// KafkaListenerEndpointRegistrar特别重要，实现了InitializingBean方法
</span><span class="c1"></span>        <span class="k">this</span><span class="o">.</span><span class="na">registrar</span><span class="o">.</span><span class="na">registerEndpoint</span><span class="o">(</span><span class="n">endpoint</span><span class="o">,</span> <span class="n">factory</span><span class="o">);</span>
        <span class="k">if</span> <span class="o">(</span><span class="n">StringUtils</span><span class="o">.</span><span class="na">hasText</span><span class="o">(</span><span class="n">beanRef</span><span class="o">))</span> <span class="o">{</span>
            <span class="k">this</span><span class="o">.</span><span class="na">listenerScope</span><span class="o">.</span><span class="na">removeListener</span><span class="o">(</span><span class="n">beanRef</span><span class="o">);</span>
        <span class="o">}</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h6 id="111114kafkalistenerendpointregistrar类registerendpoint方法">1.1.1.1.1.4、<code>KafkaListenerEndpointRegistrar</code>类<code>registerEndpoint</code>方法</h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java">    <span class="kd">public</span> <span class="kt">void</span> <span class="nf">registerEndpoint</span><span class="o">(</span><span class="n">KafkaListenerEndpoint</span> <span class="n">endpoint</span><span class="o">,</span> <span class="n">KafkaListenerContainerFactory</span><span class="o">&lt;?&gt;</span> <span class="n">factory</span><span class="o">)</span> <span class="o">{</span>
        <span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">endpoint</span><span class="o">,</span> <span class="s">&#34;Endpoint must be set&#34;</span><span class="o">);</span>
        <span class="n">Assert</span><span class="o">.</span><span class="na">hasText</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getId</span><span class="o">(),</span> <span class="s">&#34;Endpoint id must be set&#34;</span><span class="o">);</span>
        <span class="c1">// Factory may be null, we defer the resolution right before actually creating the container
</span><span class="c1"></span>
    <span class="c1">// 创建descriptor对象，里面相当于是kafkaListener的元信息
</span><span class="c1"></span>        <span class="n">KafkaListenerEndpointDescriptor</span> <span class="n">descriptor</span> <span class="o">=</span> <span class="k">new</span> <span class="n">KafkaListenerEndpointDescriptor</span><span class="o">(</span><span class="n">endpoint</span><span class="o">,</span> <span class="n">factory</span><span class="o">);</span>
        <span class="kd">synchronized</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">endpointDescriptors</span><span class="o">)</span> <span class="o">{</span>
            <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">startImmediately</span><span class="o">)</span> <span class="o">{</span> <span class="c1">// Register and start immediately
</span><span class="c1"></span>
        <span class="c1">// 当startImmediately=true，则开始注册listenerContainer容器，具体参考：1.1.1.1.2中的endpointRegistry
</span><span class="c1"></span>                <span class="k">this</span><span class="o">.</span><span class="na">endpointRegistry</span><span class="o">.</span><span class="na">registerListenerContainer</span><span class="o">(</span><span class="n">descriptor</span><span class="o">.</span><span class="na">endpoint</span><span class="o">,</span>
                        <span class="n">resolveContainerFactory</span><span class="o">(</span><span class="n">descriptor</span><span class="o">),</span> <span class="kc">true</span><span class="o">);</span>
            <span class="o">}</span>
            <span class="k">else</span> <span class="o">{</span>
                <span class="k">this</span><span class="o">.</span><span class="na">endpointDescriptors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">descriptor</span><span class="o">);</span>
            <span class="o">}</span>
        <span class="o">}</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h5 id="11112kafkalistenerendpointregistry">1.1.1.1.2、<code>KafkaListenerEndpointRegistry</code></h5>
<h6 id="111121-registerlistenercontainer">1.1.1.1.2.1、 <code>registerListenerContainer</code></h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">public</span> <span class="kt">void</span> <span class="nf">registerListenerContainer</span><span class="o">(</span><span class="n">KafkaListenerEndpoint</span> <span class="n">endpoint</span><span class="o">,</span> <span class="n">KafkaListenerContainerFactory</span><span class="o">&lt;?&gt;</span> <span class="n">factory</span><span class="o">,</span>
            <span class="kt">boolean</span> <span class="n">startImmediately</span><span class="o">)</span> <span class="o">{</span>
        <span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">endpoint</span><span class="o">,</span> <span class="s">&#34;Endpoint must not be null&#34;</span><span class="o">);</span>
        <span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">factory</span><span class="o">,</span> <span class="s">&#34;Factory must not be null&#34;</span><span class="o">);</span>

        <span class="n">String</span> <span class="n">id</span> <span class="o">=</span> <span class="n">endpoint</span><span class="o">.</span><span class="na">getId</span><span class="o">();</span>
        <span class="n">Assert</span><span class="o">.</span><span class="na">hasText</span><span class="o">(</span><span class="n">id</span><span class="o">,</span> <span class="s">&#34;Endpoint id must not be empty&#34;</span><span class="o">);</span>
        <span class="kd">synchronized</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">listenerContainers</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">Assert</span><span class="o">.</span><span class="na">state</span><span class="o">(!</span><span class="k">this</span><span class="o">.</span><span class="na">listenerContainers</span><span class="o">.</span><span class="na">containsKey</span><span class="o">(</span><span class="n">id</span><span class="o">),</span>
                    <span class="s">&#34;Another endpoint is already registered with id &#39;&#34;</span> <span class="o">+</span> <span class="n">id</span> <span class="o">+</span> <span class="s">&#34;&#39;&#34;</span><span class="o">);</span>

      <span class="c1">// 创建listenerContainer容器 参考1.1.1.1.2.2
</span><span class="c1"></span>            <span class="n">MessageListenerContainer</span> <span class="n">container</span> <span class="o">=</span> <span class="n">createListenerContainer</span><span class="o">(</span><span class="n">endpoint</span><span class="o">,</span> <span class="n">factory</span><span class="o">);</span>
            <span class="k">this</span><span class="o">.</span><span class="na">listenerContainers</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">id</span><span class="o">,</span> <span class="n">container</span><span class="o">);</span>
            <span class="k">if</span> <span class="o">(</span><span class="n">StringUtils</span><span class="o">.</span><span class="na">hasText</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getGroup</span><span class="o">())</span> <span class="o">&amp;&amp;</span> <span class="k">this</span><span class="o">.</span><span class="na">applicationContext</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
                <span class="n">List</span><span class="o">&lt;</span><span class="n">MessageListenerContainer</span><span class="o">&gt;</span> <span class="n">containerGroup</span><span class="o">;</span>
                <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">applicationContext</span><span class="o">.</span><span class="na">containsBean</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getGroup</span><span class="o">()))</span> <span class="o">{</span>
                    <span class="n">containerGroup</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">applicationContext</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getGroup</span><span class="o">(),</span> <span class="n">List</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
                <span class="o">}</span>
                <span class="k">else</span> <span class="o">{</span>
                    <span class="n">containerGroup</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">MessageListenerContainer</span><span class="o">&gt;();</span>
                    <span class="k">this</span><span class="o">.</span><span class="na">applicationContext</span><span class="o">.</span><span class="na">getBeanFactory</span><span class="o">().</span><span class="na">registerSingleton</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getGroup</span><span class="o">(),</span> <span class="n">containerGroup</span><span class="o">);</span>
                <span class="o">}</span>
                <span class="n">containerGroup</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">container</span><span class="o">);</span>
            <span class="o">}</span>
      <span class="c1">// startImmediately在`InitializingBean`接口实现中设置startImmediately = true
</span><span class="c1"></span>            <span class="k">if</span> <span class="o">(</span><span class="n">startImmediately</span><span class="o">)</span> <span class="o">{</span>
                <span class="n">startIfNecessary</span><span class="o">(</span><span class="n">container</span><span class="o">);</span>
            <span class="o">}</span>
        <span class="o">}</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h6 id="111122createlistenercontainer">1.1.1.1.2.2、<code>createListenerContainer</code></h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">protected</span> <span class="n">MessageListenerContainer</span> <span class="nf">createListenerContainer</span><span class="o">(</span><span class="n">KafkaListenerEndpoint</span> <span class="n">endpoint</span><span class="o">,</span>
            <span class="n">KafkaListenerContainerFactory</span><span class="o">&lt;?&gt;</span> <span class="n">factory</span><span class="o">)</span> <span class="o">{</span>

    <span class="c1">//使用工场创建容器，参考1.1.1.1.2.3
</span><span class="c1"></span>        <span class="n">MessageListenerContainer</span> <span class="n">listenerContainer</span> <span class="o">=</span> <span class="n">factory</span><span class="o">.</span><span class="na">createListenerContainer</span><span class="o">(</span><span class="n">endpoint</span><span class="o">);</span>
        <span class="c1">// 如果实现了InitializingBean，则调用afterPropertiesSet方法
</span><span class="c1"></span>        <span class="k">if</span> <span class="o">(</span><span class="n">listenerContainer</span> <span class="k">instanceof</span> <span class="n">InitializingBean</span><span class="o">)</span> <span class="o">{</span>
            <span class="k">try</span> <span class="o">{</span>
                <span class="o">((</span><span class="n">InitializingBean</span><span class="o">)</span> <span class="n">listenerContainer</span><span class="o">).</span><span class="na">afterPropertiesSet</span><span class="o">();</span>
            <span class="o">}</span>
            <span class="k">catch</span> <span class="o">(</span><span class="n">Exception</span> <span class="n">ex</span><span class="o">)</span> <span class="o">{</span>
                <span class="k">throw</span> <span class="k">new</span> <span class="n">BeanInitializationException</span><span class="o">(</span><span class="s">&#34;Failed to initialize message listener container&#34;</span><span class="o">,</span> <span class="n">ex</span><span class="o">);</span>
            <span class="o">}</span>
        <span class="o">}</span>

        <span class="kt">int</span> <span class="n">containerPhase</span> <span class="o">=</span> <span class="n">listenerContainer</span><span class="o">.</span><span class="na">getPhase</span><span class="o">();</span>
        <span class="k">if</span> <span class="o">(</span><span class="n">listenerContainer</span><span class="o">.</span><span class="na">isAutoStartup</span><span class="o">()</span> <span class="o">&amp;&amp;</span>
                <span class="n">containerPhase</span> <span class="o">!=</span> <span class="n">AbstractMessageListenerContainer</span><span class="o">.</span><span class="na">DEFAULT_PHASE</span><span class="o">)</span> <span class="o">{</span>  <span class="c1">// a custom phase value
</span><span class="c1"></span>            <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">phase</span> <span class="o">!=</span> <span class="n">AbstractMessageListenerContainer</span><span class="o">.</span><span class="na">DEFAULT_PHASE</span> <span class="o">&amp;&amp;</span> <span class="k">this</span><span class="o">.</span><span class="na">phase</span> <span class="o">!=</span> <span class="n">containerPhase</span><span class="o">)</span> <span class="o">{</span>
                <span class="k">throw</span> <span class="k">new</span> <span class="n">IllegalStateException</span><span class="o">(</span><span class="s">&#34;Encountered phase mismatch between container &#34;</span>
                        <span class="o">+</span> <span class="s">&#34;factory definitions: &#34;</span> <span class="o">+</span> <span class="k">this</span><span class="o">.</span><span class="na">phase</span> <span class="o">+</span> <span class="s">&#34; vs &#34;</span> <span class="o">+</span> <span class="n">containerPhase</span><span class="o">);</span>
            <span class="o">}</span>
            <span class="k">this</span><span class="o">.</span><span class="na">phase</span> <span class="o">=</span> <span class="n">listenerContainer</span><span class="o">.</span><span class="na">getPhase</span><span class="o">();</span>
        <span class="o">}</span>

        <span class="k">return</span> <span class="n">listenerContainer</span><span class="o">;</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h6 id="111123createlistenercontainer">1.1.1.1.2.3、<code>createListenerContainer</code></h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
    <span class="kd">public</span> <span class="n">C</span> <span class="nf">createListenerContainer</span><span class="o">(</span><span class="n">KafkaListenerEndpoint</span> <span class="n">endpoint</span><span class="o">)</span> <span class="o">{</span>
    <span class="c1">// 创建容器实例，参考1.1.1.1.2.4
</span><span class="c1"></span>        <span class="n">C</span> <span class="n">instance</span> <span class="o">=</span> <span class="n">createContainerInstance</span><span class="o">(</span><span class="n">endpoint</span><span class="o">);</span>

        <span class="k">if</span> <span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getId</span><span class="o">()</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">setBeanName</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getId</span><span class="o">());</span>
        <span class="o">}</span>
        <span class="k">if</span> <span class="o">(</span><span class="n">endpoint</span> <span class="k">instanceof</span> <span class="n">AbstractKafkaListenerEndpoint</span><span class="o">)</span> <span class="o">{</span>
      <span class="c1">//配置endpoint的额外属性
</span><span class="c1"></span>            <span class="n">configureEndpoint</span><span class="o">((</span><span class="n">AbstractKafkaListenerEndpoint</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;)</span> <span class="n">endpoint</span><span class="o">);</span>
        <span class="o">}</span>

        <span class="n">endpoint</span><span class="o">.</span><span class="na">setupListenerContainer</span><span class="o">(</span><span class="n">instance</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">messageConverter</span><span class="o">);</span>
    <span class="c1">// 初始化容器实例，参考1.1.1.1.2.5
</span><span class="c1"></span>        <span class="n">initializeContainer</span><span class="o">(</span><span class="n">instance</span><span class="o">,</span> <span class="n">endpoint</span><span class="o">);</span>

        <span class="k">return</span> <span class="n">instance</span><span class="o">;</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h6 id="111124createcontainerinstance">1.1.1.1.2.4、<code>createContainerInstance</code></h6>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
    <span class="kd">protected</span> <span class="n">ConcurrentMessageListenerContainer</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;</span> <span class="nf">createContainerInstance</span><span class="o">(</span><span class="n">KafkaListenerEndpoint</span> <span class="n">endpoint</span><span class="o">)</span> <span class="o">{</span>
        <span class="n">Collection</span><span class="o">&lt;</span><span class="n">TopicPartitionInitialOffset</span><span class="o">&gt;</span> <span class="n">topicPartitions</span> <span class="o">=</span> <span class="n">endpoint</span><span class="o">.</span><span class="na">getTopicPartitions</span><span class="o">();</span>
        <span class="k">if</span> <span class="o">(!</span><span class="n">topicPartitions</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">())</span> <span class="o">{</span>
            <span class="n">ContainerProperties</span> <span class="n">properties</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ContainerProperties</span><span class="o">(</span>
                    <span class="n">topicPartitions</span><span class="o">.</span><span class="na">toArray</span><span class="o">(</span><span class="k">new</span> <span class="n">TopicPartitionInitialOffset</span><span class="o">[</span><span class="n">topicPartitions</span><span class="o">.</span><span class="na">size</span><span class="o">()]));</span>
            <span class="k">return</span> <span class="k">new</span> <span class="n">ConcurrentMessageListenerContainer</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;(</span><span class="n">getConsumerFactory</span><span class="o">(),</span> <span class="n">properties</span><span class="o">);</span>
        <span class="o">}</span>
        <span class="k">else</span> <span class="o">{</span>
            <span class="n">Collection</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="n">topics</span> <span class="o">=</span> <span class="n">endpoint</span><span class="o">.</span><span class="na">getTopics</span><span class="o">();</span>
            <span class="k">if</span> <span class="o">(!</span><span class="n">topics</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">())</span> <span class="o">{</span>
                <span class="n">ContainerProperties</span> <span class="n">properties</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ContainerProperties</span><span class="o">(</span><span class="n">topics</span><span class="o">.</span><span class="na">toArray</span><span class="o">(</span><span class="k">new</span> <span class="n">String</span><span class="o">[</span><span class="n">topics</span><span class="o">.</span><span class="na">size</span><span class="o">()]));</span>
                <span class="k">return</span> <span class="k">new</span> <span class="n">ConcurrentMessageListenerContainer</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;(</span><span class="n">getConsumerFactory</span><span class="o">(),</span> <span class="n">properties</span><span class="o">);</span>
            <span class="o">}</span>
            <span class="k">else</span> <span class="o">{</span>
                <span class="n">ContainerProperties</span> <span class="n">properties</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ContainerProperties</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getTopicPattern</span><span class="o">());</span>
                <span class="k">return</span> <span class="k">new</span> <span class="n">ConcurrentMessageListenerContainer</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;(</span><span class="n">getConsumerFactory</span><span class="o">(),</span> <span class="n">properties</span><span class="o">);</span>
            <span class="o">}</span>
        <span class="o">}</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h6 id="111125initializecontainer">1.1.1.1.2.5、<code>initializeContainer</code></h6>
<p>配置容器的属性，比如rollback，ack模式等，至此就容器就配置完成了</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java">    <span class="kd">protected</span> <span class="kt">void</span> <span class="nf">initializeContainer</span><span class="o">(</span><span class="n">C</span> <span class="n">instance</span><span class="o">,</span> <span class="n">KafkaListenerEndpoint</span> <span class="n">endpoint</span><span class="o">)</span> <span class="o">{</span>
        <span class="n">ContainerProperties</span> <span class="n">properties</span> <span class="o">=</span> <span class="n">instance</span><span class="o">.</span><span class="na">getContainerProperties</span><span class="o">();</span>
        <span class="n">BeanUtils</span><span class="o">.</span><span class="na">copyProperties</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">containerProperties</span><span class="o">,</span> <span class="n">properties</span><span class="o">,</span> <span class="s">&#34;topics&#34;</span><span class="o">,</span> <span class="s">&#34;topicPartitions&#34;</span><span class="o">,</span> <span class="s">&#34;topicPattern&#34;</span><span class="o">,</span>
                <span class="s">&#34;messageListener&#34;</span><span class="o">,</span> <span class="s">&#34;ackCount&#34;</span><span class="o">,</span> <span class="s">&#34;ackTime&#34;</span><span class="o">);</span>
        <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">afterRollbackProcessor</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">setAfterRollbackProcessor</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">afterRollbackProcessor</span><span class="o">);</span>
        <span class="o">}</span>
        <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">containerProperties</span><span class="o">.</span><span class="na">getAckCount</span><span class="o">()</span> <span class="o">&gt;</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">properties</span><span class="o">.</span><span class="na">setAckCount</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">containerProperties</span><span class="o">.</span><span class="na">getAckCount</span><span class="o">());</span>
        <span class="o">}</span>
        <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">containerProperties</span><span class="o">.</span><span class="na">getAckTime</span><span class="o">()</span> <span class="o">&gt;</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">properties</span><span class="o">.</span><span class="na">setAckTime</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">containerProperties</span><span class="o">.</span><span class="na">getAckTime</span><span class="o">());</span>
        <span class="o">}</span>
        <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">errorHandler</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">setGenericErrorHandler</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">errorHandler</span><span class="o">);</span>
        <span class="o">}</span>
        <span class="k">if</span> <span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getAutoStartup</span><span class="o">()</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">setAutoStartup</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getAutoStartup</span><span class="o">());</span>
        <span class="o">}</span>
        <span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">autoStartup</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">setAutoStartup</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">autoStartup</span><span class="o">);</span>
        <span class="o">}</span>
        <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">phase</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">setPhase</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">phase</span><span class="o">);</span>
        <span class="o">}</span>
        <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">applicationEventPublisher</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">setApplicationEventPublisher</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">applicationEventPublisher</span><span class="o">);</span>
        <span class="o">}</span>
        <span class="n">instance</span><span class="o">.</span><span class="na">getContainerProperties</span><span class="o">().</span><span class="na">setGroupId</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getGroupId</span><span class="o">());</span>
        <span class="n">instance</span><span class="o">.</span><span class="na">getContainerProperties</span><span class="o">().</span><span class="na">setClientId</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getClientIdPrefix</span><span class="o">());</span>
        <span class="k">if</span> <span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getConsumerProperties</span><span class="o">()</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
            <span class="n">instance</span><span class="o">.</span><span class="na">getContainerProperties</span><span class="o">().</span><span class="na">setConsumerProperties</span><span class="o">(</span><span class="n">endpoint</span><span class="o">.</span><span class="na">getConsumerProperties</span><span class="o">());</span>
        <span class="o">}</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><p>到此为止也只看到了容器的初始化完成，那么是在哪里开始连接kafka的broker并且消费数据的呢？</p>
<p>上面的代码中有一处可以看到<code>1.1.1.1.2.1</code>中</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="k">if</span> <span class="o">(</span><span class="n">startImmediately</span><span class="o">)</span> <span class="o">{</span>
    <span class="n">startIfNecessary</span><span class="o">(</span><span class="n">container</span><span class="o">);</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><p>但是要满足条件，applicationContext refresh完或者设置了listenerContainer开启了autoStart</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">private</span> <span class="kt">void</span> <span class="nf">startIfNecessary</span><span class="o">(</span><span class="n">MessageListenerContainer</span> <span class="n">listenerContainer</span><span class="o">)</span> <span class="o">{</span>
        <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">contextRefreshed</span> <span class="o">||</span> <span class="n">listenerContainer</span><span class="o">.</span><span class="na">isAutoStartup</span><span class="o">())</span> <span class="o">{</span>
            <span class="n">listenerContainer</span><span class="o">.</span><span class="na">start</span><span class="o">();</span>
        <span class="o">}</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><p>还有其他地方吗？翻遍代码发现容器实现了接口<code>SmartLifecycle</code></p>
<p><img
        class="lazyload"
        src="/svg/loading.min.svg"
        data-src="https://jyd01.oss-cn-beijing.aliyuncs.com/uPic/image-20191129144939915.png"
        data-srcset="https://jyd01.oss-cn-beijing.aliyuncs.com/uPic/image-20191129144939915.png, https://jyd01.oss-cn-beijing.aliyuncs.com/uPic/image-20191129144939915.png 1.5x, https://jyd01.oss-cn-beijing.aliyuncs.com/uPic/image-20191129144939915.png 2x"
        data-sizes="auto"
        alt="https://jyd01.oss-cn-beijing.aliyuncs.com/uPic/image-20191129144939915.png"
        title="image-20191129144939915" /></p>
<p>发现父类<code>AbstractMessageListenerContainer</code>实现了<code>start</code>方法</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
    <span class="kd">public</span> <span class="kd">final</span> <span class="kt">void</span> <span class="nf">start</span><span class="o">()</span> <span class="o">{</span>
        <span class="n">checkGroupId</span><span class="o">();</span>
        <span class="kd">synchronized</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">lifecycleMonitor</span><span class="o">)</span> <span class="o">{</span>
            <span class="k">if</span> <span class="o">(!</span><span class="n">isRunning</span><span class="o">())</span> <span class="o">{</span>
                <span class="n">Assert</span><span class="o">.</span><span class="na">isTrue</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">containerProperties</span><span class="o">.</span><span class="na">getMessageListener</span><span class="o">()</span> <span class="k">instanceof</span> <span class="n">GenericMessageListener</span><span class="o">,</span>
                        <span class="o">()</span> <span class="o">-&gt;</span> <span class="s">&#34;A &#34;</span> <span class="o">+</span> <span class="n">GenericMessageListener</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">()</span> <span class="o">+</span> <span class="s">&#34; implementation must be provided&#34;</span><span class="o">);</span>
                <span class="n">doStart</span><span class="o">();</span>
            <span class="o">}</span>
        <span class="o">}</span>
    <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><p>然后子类重写<code>doStart</code>方法</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
<span class="kd">protected</span> <span class="kt">void</span> <span class="nf">doStart</span><span class="o">()</span> <span class="o">{</span>
  <span class="k">if</span> <span class="o">(!</span><span class="n">isRunning</span><span class="o">())</span> <span class="o">{</span>
    <span class="n">checkTopics</span><span class="o">();</span>
    <span class="n">ContainerProperties</span> <span class="n">containerProperties</span> <span class="o">=</span> <span class="n">getContainerProperties</span><span class="o">();</span>
    <span class="n">TopicPartitionInitialOffset</span><span class="o">[]</span> <span class="n">topicPartitions</span> <span class="o">=</span> <span class="n">containerProperties</span><span class="o">.</span><span class="na">getTopicPartitions</span><span class="o">();</span>
    <span class="k">if</span> <span class="o">(</span><span class="n">topicPartitions</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="k">this</span><span class="o">.</span><span class="na">concurrency</span> <span class="o">&gt;</span> <span class="n">topicPartitions</span><span class="o">.</span><span class="na">length</span><span class="o">)</span> <span class="o">{</span>
      <span class="k">this</span><span class="o">.</span><span class="na">logger</span><span class="o">.</span><span class="na">warn</span><span class="o">(</span><span class="s">&#34;When specific partitions are provided, the concurrency must be less than or &#34;</span>
                       <span class="o">+</span> <span class="s">&#34;equal to the number of partitions; reduced from &#34;</span> <span class="o">+</span> <span class="k">this</span><span class="o">.</span><span class="na">concurrency</span> <span class="o">+</span> <span class="s">&#34; to &#34;</span>
                       <span class="o">+</span> <span class="n">topicPartitions</span><span class="o">.</span><span class="na">length</span><span class="o">);</span>
      <span class="k">this</span><span class="o">.</span><span class="na">concurrency</span> <span class="o">=</span> <span class="n">topicPartitions</span><span class="o">.</span><span class="na">length</span><span class="o">;</span>
    <span class="o">}</span>
    <span class="n">setRunning</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
        <span class="c1">// 根据
</span><span class="c1"></span>    <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">0</span><span class="o">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="k">this</span><span class="o">.</span><span class="na">concurrency</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span>
      <span class="n">KafkaMessageListenerContainer</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;</span> <span class="n">container</span><span class="o">;</span>
      <span class="k">if</span> <span class="o">(</span><span class="n">topicPartitions</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
        <span class="n">container</span> <span class="o">=</span> <span class="k">new</span> <span class="n">KafkaMessageListenerContainer</span><span class="o">&lt;&gt;(</span><span class="k">this</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">consumerFactory</span><span class="o">,</span> <span class="n">containerProperties</span><span class="o">);</span>
      <span class="o">}</span>
      <span class="k">else</span> <span class="o">{</span>
        <span class="n">container</span> <span class="o">=</span> <span class="k">new</span> <span class="n">KafkaMessageListenerContainer</span><span class="o">&lt;&gt;(</span><span class="k">this</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">consumerFactory</span><span class="o">,</span>
                                                        <span class="n">containerProperties</span><span class="o">,</span> <span class="n">partitionSubset</span><span class="o">(</span><span class="n">containerProperties</span><span class="o">,</span> <span class="n">i</span><span class="o">));</span>
      <span class="o">}</span>
      <span class="n">String</span> <span class="n">beanName</span> <span class="o">=</span> <span class="n">getBeanName</span><span class="o">();</span>
      <span class="n">container</span><span class="o">.</span><span class="na">setBeanName</span><span class="o">((</span><span class="n">beanName</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">?</span> <span class="n">beanName</span> <span class="o">:</span> <span class="s">&#34;consumer&#34;</span><span class="o">)</span> <span class="o">+</span> <span class="s">&#34;-&#34;</span> <span class="o">+</span> <span class="n">i</span><span class="o">);</span>
      <span class="k">if</span> <span class="o">(</span><span class="n">getApplicationEventPublisher</span><span class="o">()</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
        <span class="n">container</span><span class="o">.</span><span class="na">setApplicationEventPublisher</span><span class="o">(</span><span class="n">getApplicationEventPublisher</span><span class="o">());</span>
      <span class="o">}</span>
      <span class="n">container</span><span class="o">.</span><span class="na">setClientIdSuffix</span><span class="o">(</span><span class="s">&#34;-&#34;</span> <span class="o">+</span> <span class="n">i</span><span class="o">);</span>
      <span class="n">container</span><span class="o">.</span><span class="na">setGenericErrorHandler</span><span class="o">(</span><span class="n">getGenericErrorHandler</span><span class="o">());</span>
      <span class="n">container</span><span class="o">.</span><span class="na">setAfterRollbackProcessor</span><span class="o">(</span><span class="n">getAfterRollbackProcessor</span><span class="o">());</span>
      <span class="n">container</span><span class="o">.</span><span class="na">setEmergencyStop</span><span class="o">(()</span> <span class="o">-&gt;</span> <span class="o">{</span>
        <span class="n">stop</span><span class="o">(()</span> <span class="o">-&gt;</span> <span class="o">{</span>
          <span class="c1">// NOSONAR
</span><span class="c1"></span>        <span class="o">});</span>
        <span class="n">publishContainerStoppedEvent</span><span class="o">();</span>
      <span class="o">});</span>
      <span class="n">container</span><span class="o">.</span><span class="na">start</span><span class="o">();</span>
      <span class="k">this</span><span class="o">.</span><span class="na">containers</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">container</span><span class="o">);</span>
    <span class="o">}</span>
  <span class="o">}</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h3 id="113-kafkamessagelistenercontainer">1.1.3、 <code>KafkaMessageListenerContainer</code></h3>
<blockquote>
<p><code>KafkaMessageListenerContainer</code> 该类封装了<code>KafkaConsumer</code> ，主要作用是连接kafka，并且poll数据，然后根据配置处理数据。</p>
</blockquote>
<ul>
<li>run 方法</li>
</ul>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@Override</span>
        <span class="kd">public</span> <span class="kt">void</span> <span class="nf">run</span><span class="o">()</span> <span class="o">{</span>
            <span class="k">this</span><span class="o">.</span><span class="na">consumerThread</span> <span class="o">=</span> <span class="n">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">();</span>
            <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">genericListener</span> <span class="k">instanceof</span> <span class="n">ConsumerSeekAware</span><span class="o">)</span> <span class="o">{</span>
                <span class="o">((</span><span class="n">ConsumerSeekAware</span><span class="o">)</span> <span class="k">this</span><span class="o">.</span><span class="na">genericListener</span><span class="o">).</span><span class="na">registerSeekCallback</span><span class="o">(</span><span class="k">this</span><span class="o">);</span>
            <span class="o">}</span>
            <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">transactionManager</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
                <span class="n">ProducerFactoryUtils</span><span class="o">.</span><span class="na">setConsumerGroupId</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">consumerGroupId</span><span class="o">);</span>
            <span class="o">}</span>
            <span class="k">this</span><span class="o">.</span><span class="na">count</span> <span class="o">=</span> <span class="n">0</span><span class="o">;</span>
            <span class="k">this</span><span class="o">.</span><span class="na">last</span> <span class="o">=</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">();</span>
      <span class="c1">// 初始消费者线程绑定分区
</span><span class="c1"></span>            <span class="n">initAsignedPartitions</span><span class="o">();</span>
            <span class="k">while</span> <span class="o">(</span><span class="n">isRunning</span><span class="o">())</span> <span class="o">{</span>
                <span class="k">try</span> <span class="o">{</span>
          <span class="c1">// 拉取数据并且调用listener注解的业务方法处理数据
</span><span class="c1"></span>                    <span class="n">pollAndInvoke</span><span class="o">();</span>
                <span class="o">}</span>
                <span class="k">catch</span> <span class="o">(</span><span class="nd">@SuppressWarnings</span><span class="o">(</span><span class="n">UNUSED</span><span class="o">)</span> <span class="n">WakeupException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
                    <span class="c1">// Ignore, we&#39;re stopping
</span><span class="c1"></span>                <span class="o">}</span>
                <span class="k">catch</span> <span class="o">(</span><span class="n">NoOffsetForPartitionException</span> <span class="n">nofpe</span><span class="o">)</span> <span class="o">{</span>
                    <span class="k">this</span><span class="o">.</span><span class="na">fatalError</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
                    <span class="n">ListenerConsumer</span><span class="o">.</span><span class="na">this</span><span class="o">.</span><span class="na">logger</span><span class="o">.</span><span class="na">error</span><span class="o">(</span><span class="s">&#34;No offset and no reset policy&#34;</span><span class="o">,</span> <span class="n">nofpe</span><span class="o">);</span>
                    <span class="k">break</span><span class="o">;</span>
                <span class="o">}</span>
                <span class="k">catch</span> <span class="o">(</span><span class="n">Exception</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
                    <span class="n">handleConsumerException</span><span class="o">(</span><span class="n">e</span><span class="o">);</span>
                <span class="o">}</span>
                <span class="k">catch</span> <span class="o">(</span><span class="n">Error</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span> <span class="c1">// NOSONAR - rethrown
</span><span class="c1"></span>                    <span class="n">Runnable</span> <span class="n">runnable</span> <span class="o">=</span> <span class="n">KafkaMessageListenerContainer</span><span class="o">.</span><span class="na">this</span><span class="o">.</span><span class="na">emergencyStop</span><span class="o">;</span>
                    <span class="k">if</span> <span class="o">(</span><span class="n">runnable</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
                        <span class="n">runnable</span><span class="o">.</span><span class="na">run</span><span class="o">();</span>
                    <span class="o">}</span>
                    <span class="k">this</span><span class="o">.</span><span class="na">logger</span><span class="o">.</span><span class="na">error</span><span class="o">(</span><span class="s">&#34;Stopping container due to an Error&#34;</span><span class="o">,</span> <span class="n">e</span><span class="o">);</span>
                    <span class="n">wrapUp</span><span class="o">();</span>
                    <span class="k">throw</span> <span class="n">e</span><span class="o">;</span>
                <span class="o">}</span>
            <span class="o">}</span>
            <span class="n">wrapUp</span><span class="o">();</span>
        <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><ul>
<li>pollAndInvoke 方法</li>
</ul>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">protected</span> <span class="kt">void</span> <span class="nf">pollAndInvoke</span><span class="o">()</span> <span class="o">{</span>
      <span class="c1">// 非自动提交并且(ack == COUNT || COUNT_TIME)，处理co
</span><span class="c1"></span>            <span class="k">if</span> <span class="o">(!</span><span class="k">this</span><span class="o">.</span><span class="na">autoCommit</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="k">this</span><span class="o">.</span><span class="na">isRecordAck</span><span class="o">)</span> <span class="o">{</span>
        <span class="c1">// 该方法会提交ack，但是会判断是否该线程消费者线程，还会判断ack mode.只有非手动提交的这里才会提交。并且注意，提交线程一但提交，因为是多线程消费，会出现消费顺序不一致。
</span><span class="c1"></span>                <span class="n">processCommits</span><span class="o">();</span>
            <span class="o">}</span>
          <span class="c1">// seek 指定消费者偏移量
</span><span class="c1"></span>            <span class="n">processSeeks</span><span class="o">();</span>
            <span class="n">checkPaused</span><span class="o">();</span>
      <span class="c1">// 开始拉取数据，指定超时时间
</span><span class="c1"></span>            <span class="n">ConsumerRecords</span><span class="o">&lt;</span><span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;</span> <span class="n">records</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">consumer</span><span class="o">.</span><span class="na">poll</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">pollTimeout</span><span class="o">);</span>
            <span class="k">this</span><span class="o">.</span><span class="na">lastPoll</span> <span class="o">=</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">();</span>
            <span class="n">checkResumed</span><span class="o">();</span>
            <span class="n">debugRecords</span><span class="o">(</span><span class="n">records</span><span class="o">);</span>
            <span class="k">if</span> <span class="o">(</span><span class="n">records</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="n">records</span><span class="o">.</span><span class="na">count</span><span class="o">()</span> <span class="o">&gt;</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
                <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">containerProperties</span><span class="o">.</span><span class="na">getIdleEventInterval</span><span class="o">()</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
                    <span class="k">this</span><span class="o">.</span><span class="na">lastReceive</span> <span class="o">=</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">();</span>
                <span class="o">}</span>
        <span class="c1">// 调用@KafkaListener注解的业务代码，方法内部会判断是否有事务
</span><span class="c1"></span>                <span class="n">invokeListener</span><span class="o">(</span><span class="n">records</span><span class="o">);</span>
            <span class="o">}</span>
            <span class="k">else</span> <span class="o">{</span>
                <span class="n">checkIdle</span><span class="o">();</span>
            <span class="o">}</span>
        <span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h2 id="12-要点">1.2 要点</h2>
<ol>
<li>多线徎多记录消费顺序会不一致，手动提交偏移量会导致数据数据丢失</li>
<li>一个@KafkaListener会启动concurrency个消费者；concurrency应该小于等于partitions数。</li>
</ol>
<h2 id="引用">引用</h2>
<p>[1] spring-kafka源码解析 <a href="https://blog.csdn.net/qq_26323323/article/details/84938892" target="_blank" rel="noopener noreffer">https://blog.csdn.net/qq_26323323/article/details/84938892</a></p></div><div class="post-footer" id="post-footer">
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